Engineering Alloxazines by Boron Coordination and Click Chemistry toward Small-molecule Fluorescent Probes

Area of Science:

• Organic Chemistry
• Biochemistry
• Materials Science

Background:

• Redox cofactors, like flavins, possess innate fluorescence, making them attractive for molecular probe design.
• Strategic modification of these cofactors can improve probe compatibility and affinity.
• Current synthetic methods for functionalized flavins and alloxazine isomers are limited.

Purpose of the Study:

• To develop an accessible synthetic route to bioinspired fluorescent alloxazines.
• To investigate the influence of aromatic substitution on the photophysical properties of these alloxazines.
• To demonstrate the utility of click chemistry for further derivatization.

Main Methods:

• Synthesis of novel fluorescent alloxazines incorporating a boron difluorocatecholate moiety.
• Exploration of core aromatic substitution patterns.
• Application of copper-catalyzed azide-alkyne cycloaddition (CuAAC) click chemistry for derivatization.

Main Results:

• Achieved facile synthesis of bioinspired fluorescent alloxazines.
• Demonstrated that core aromatic substitution significantly impacts photophysical properties.
• Successfully employed click chemistry for straightforward derivatization of the synthesized alloxazines.

Conclusions:

• The developed method provides easy access to functionalized fluorescent alloxazines.
• These compounds serve as versatile platforms for creating advanced molecular probes.
• The synthetic strategy facilitates property modulation and targeted applications.